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MC35i Terminal Hardware Interface Description

Confidential / Released

MC35i_T_HD_v02.00a Page 20 of 42 16.02.2007

3.5.1 Power supply and On/Off control

The power supply of the MC35i Terminal has to be a single voltage source of

PLUS

=8V…30V capable of providing a peak current (pulsed 577ms at T=4.615ms) of about

1.2A at 12V during an active transmission. The uplink burst causes strong ripple (drop) on

the power lines. The drop voltage should not exceed 1V, but the absolute minimum voltage

during drops must be >7.6V.

The MC35i Terminal is protected from supply voltage reversal and overvoltage. An internal

fuse that is not removable is intended for electrical safety according to EN60950. An external

fast acting fuse 0.4A with melting integral I²t (0.15 … 0.25)A²s is necessary to use the

MC35i Terminal at a 12V or 24V power supply system for vehicles.

The power supply must be compliant with the EN60950 guidelines.

A switching regulator regulates the input voltage for the internal supply. In POWER DOWN

mode the switching regulator is turned off by the On/Off logic. A separate voltage regulator

supplies the real time clock (RTC) in the GSM engine.

When power fails for >1ms, MC35i Terminal resets or switches off. When power fails for >7s

the RTC will be reset.

Table 10: Female 6-pole Western plug for power supply, ignition, power down

Pin Signal name Use Parameters

1 PLUS Power supply 8V – 30V DC, max. 33V for 1 min

2 free --- ---

3 PD_IN Signal for POWER DOWN mode U

5V for t>3.5s turns the terminal off.

<2V and low level for normal operation.

4 IGT_IN Ignition

5V

Ignition 5V for more than 200ms switches

the MC35i Terminal on. Ignition is activated

only by a rising edge. The rise time is

<20ms

5 free --- ---

6 GND Ground 0V

Figure 4: 6-pole Western jack for power

supply, ignition, power down

Mains adapter: If it fits into the design of your GSM application we recommend the plug-in

supply unit used with the type approved Siemens reference setup. Ordering information can

be found in Chapter

7. This 12V mains adapter comes with a 6-pole Western plug and

provides an internal connection between IGT_IN pin and PLUS pin for auto ignition (power

up).

Pin assignment:

2 free

5 free

1 +

3 PD_IN

4 IGT_IN

6 GND

1 2 ... 15 16 17 18 19 20 21 22 23 24 25 ... 41 42

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